Hach-Lange CL17 USER MANUAL - Manual (Page 16)

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Installation
3.6 Sample conditioning
All samples are “conditioned” using the single-sample, basic sample conditioning kit
shipped with each analyzer. The kit eliminates large particles using a 40-mesh strainer.
The ball valve on the raw sample inlet line may be used to control the amount of bypass
flow that is delivered to the filter. For dirty water, high bypass will adjust it to help keep the
strainer clean longer, or adjust it to any partially open position for continuous bypass.
Adjust the ball valve on the instrument supply line to control the flow rate of filtered
sample to the instrument.
Note: Installing the drain tee more than 2 feet above the instrument can result in excessive pressure
which may cause leaks.
Mount the centerline of the bypass drain tee two feet above the instrument. Refer to
Figure 7 . When properly mounted, the vacuum breaker design of the bypass drain tee
prevents negative sample pressure and establishes the needed positive sample pressure
for sample flow through the analyzer.
3.6.1 Assemble the sample conditioning kit
Refer to the complete system diagram in Figure 7 and the tips in Table 3 to assemble the
components.
• Seal all threaded fittings with two wraps of Teflon ® tape (provided).
• Two stops should be felt when installing tubing into the push-in fitting. The first is when
the tubing clears the gripper ring, and the second is when the tubing meets the bottom
of the itting. To prevent leaks, make sure to push the tubing all the way in.
Note: To help grip the tubing, use rubber gloves or other material that grips and forcefully push the
tubing into the fitting. Two stops should be felt; otherwise the tubing will not be fully inserted and will
leak.
• Be sure to cut all tubing used in the push-in fittings with a sharp knife so the ends are
round, cleanly cut and not angled.
• The push-in fittings are designed for use with soft, ¼-inch OD plastic tubing as
included in the kit. Tubing material such as PTFE or HDPE is recommended. The
push-in fitting will not grip hard plastic or metal tubing and the tubing will slip out.
Figure 6 Sample line location in the process stream
1 Poor 4 Sediment (typical)
2 Poor 5 Good
3 Air (typical) 6 Best